HDMI Signal Receiving Equalizer With Adaptive Swing-Level Control
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Solution Overview
Problem
High-definition multimedia interface (HDMI) signals face issues such as noise, signal leakage, and severe signal attenuation, especially with higher frequencies and longer cable transmissions, necessitating improved signal compensation performance and automatic gain control in equalizers.
Innovation Solution
A signal receiving apparatus with a processor that adjusts the swing level of output signals using a detector to ensure it falls within a preset range, determining DC and AC gains through stepwise adjustments to optimize equalizer performance, incorporating continuous time linear and decision feedback equalizers to reduce inter-symbol interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If the frequency of HDMI signal is increased to support higher definition, then the multimedia information quality is improved, but noise and signal leakage problems worsen
Solution Approach 1:
The patent adjusts the swing level parameter of the equalizer output signal to optimize signal quality. By dynamically changing the swing level parameter, the system compensates for signal degradation at higher frequencies while maintaining stable operation and reducing noise impact.
2Length of stationary object
If signal transmission through longer cable is implemented, then the transmission distance is extended, but signal attenuation becomes more severe
Solution Approach 1:
The patent implements dynamic swing level adjustment in the equalizer based on detected signal characteristics. This dynamic adaptation allows the system to compensate for varying attenuation levels caused by different cable lengths, maintaining consistent signal quality whether the cable is short or long.
Solution Approach 2:
The system uses a detector to monitor the output signal swing level and provides feedback to the processor, which then adjusts the equalizer gain accordingly. This feedback mechanism enables automatic compensation for signal attenuation regardless of cable length, ensuring stable signal reception.
3Reliability
If the equalizer gain is increased to compensate for signal attenuation, then the signal compensation performance is improved, but operation stability deteriorates
Solution Approach 1:
The patent carefully adjusts the swing level parameter within an optimal range rather than simply increasing gain. This parameter optimization achieves signal compensation while maintaining equalizer stability, avoiding the oscillation and distortion that would result from excessive gain amplification.
4Adaptability or versatility
If adaptive equalizer gain adjustment is implemented, then the compensation efficiency for various cables is maximized, but device complexity increases
Solution Approach 1:
The patent employs a feedback-based automatic gain control system where a detector monitors the output signal and the processor automatically adjusts the equalizer swing level. This closed-loop approach achieves adaptive compensation for various cable conditions without requiring complex manual configuration or multiple fixed-gain modes.
Solution Approach 2:
The equalizer system performs self-adjustment by automatically detecting signal characteristics and modifying its own gain settings. The processor and detector work together to enable the equalizer to adapt to different cable lengths and conditions autonomously, reducing the need for external intervention or complex control interfaces.
Data Source
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AI summary
Disclosed herein are a signal receiving apparatus capable of improving signal compensation performance and a signal processing method thereof. The signal receiving apparatus includes a terminal configured to receive a signal from an external device; and an equalizer configured to reduce inter-symbol interference of the signal received through the terminal. A swing level of an output signal output from the equalizer is maintained in a preset range.